Research

Effect of the ionosphere on defocusing of space-based radars


Reference:

van de Kamp, M., Cannon, P. and Terkildsen, M., 2009. Effect of the ionosphere on defocusing of space-based radars. Radio Science, 44 (1), RS1003.

Related documents:

This repository does not currently have the full-text of this item.
You may be able to access a copy if URLs are provided below. (Contact Author)

Official URL:

http://dx.doi.org/10.1029/2007RS003808

Abstract

Space-based synthetic aperture radars can be detrimentally affected by electron density variations in the ionosphere, which cause signal phase variations resulting in image defocusing. In order to evaluate the significance of this problem, this paper determines how often the phase perturbations are large enough to cause defocusing. High cadence GPS TEC signals collected on Ascension Island during sunspot minimum and in Papua New Guinea over half a solar cycle have been analyzed. Both locations lie in the equatorial crest region. For a space-based synthetic radar operating at 435 MHz, the average probability of defocusing varies from zero at quiet times, to around 1% between 18: 00 and 24: 00 at solar minimum, and to 45% between 18: 00 and 24: 00 at solar maximum. Corresponding values are given for radars operating at other frequencies. A method is developed to estimate such variations from the large database of S-4 measurements.

Details

Item Type Articles
Creatorsvan de Kamp, M., Cannon, P. and Terkildsen, M.
DOI10.1029/2007RS003808
DepartmentsFaculty of Engineering & Design > Electronic & Electrical Engineering
RefereedYes
StatusPublished
ID Code12623

Export

Actions (login required)

View Item